#include<stdio.h>
int thesum(int n)
{
  int sum=0;
  int i=0;
  for(i=1;i<=n;i++)
  {
    sum+=i;
  }
  return sum;
}
int main()
{
  printf("hello linux\n");
  int ret=thesum(100);
  printf("ret=%d\n",ret);
  return 0;
}
